I agree with Ros.
I've never heard of a pole-pig or an autoformer get more that just
above warm running a pair of 4-1000s yellow-orange. If you have it
.... use it.
Don W4DNR
Quoting Ros <ros@netbox.com>:
First, the Variac is not a transformer in the classical sense, it is
an autoformer or auto-trans-former. It will not lose efficiency.
Here is a schematic of one and perhaps you can see why it won't lose
efficiency.
A common transformer has less efficiency than an autoformer due to
core loses, eddy currents, hysteresis, more heat (I2R losses), etc.
Ros, W5BRY
On 7/22/2015 8:28 PM, Steve Bookout wrote:
Hello all,
Thanks to everyone for the informative responses. Although I've
now got more info to use in order to figure out what I am going to
do, I'm not sure what that will be.
It's really just a bit 'hot' for my needs and if I turn it down
with a variac, regulation may suffer. I do have a stack of two
variacs on a common shaft, and although they are large, I don't
know what their actual specs are. Something for me to check.
73 de Steve, NR4M
On 7/21/2015 03:03 , Steve Bookout wrote:
Hello all.
Question for the experts.
How does using a Variac to control the output of a HV transformer
affect things like efficiency?
I think it would be reasonable to think that a transformer
operated at less than rated input voltage would be less efficient
than one run at full primary voltage. I mean, it cost 'something'
just to make a transformer act like a transformer.
I ask because I have a perfectly fine 'pole pig' transformer rated
at 5 KVA. 7200 AC volts on the output (reversed) is a bit much
for my needs, so was wondering what the trade-off would be if it
were run at considerably less than 220 input.
I can see this is a better xformer for a 4cx10000, than anything I
would be using, but I have what I have.
73 de Steve, NR4M
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